GMAT Verbal: Reading Comprehension Main Idea and Detail

Question 1

Passage: 'The decline of bee populations worldwide has alarmed ecologists and agricultural scientists alike. Bees pollinate roughly one-third of the food crops humans consume, and their disappearance would cascade through food chains in unpredictable ways. Habitat loss, pesticide exposure, and the spread of parasitic mites have each been implicated, though researchers debate which factor is most significant. Some evidence suggests that neonicotinoid pesticides disrupt bees' navigational abilities, preventing them from returning to their hives.'

The primary purpose of this passage is to:

Accepted Answer

Describe the problem of declining bee populations and identify contributing factors

Answer

The passage introduces the problem (declining bee populations), explains its importance (one-third of food crops), and lists multiple contributing factors. It does not advocate for one cause or propose solutions.

Question 2

Passage: 'The decline of bee populations worldwide has alarmed ecologists and agricultural scientists alike. Bees pollinate roughly one-third of the food crops humans consume, and their disappearance would cascade through food chains in unpredictable ways. Habitat loss, pesticide exposure, and the spread of parasitic mites have each been implicated, though researchers debate which factor is most significant. Some evidence suggests that neonicotinoid pesticides disrupt bees' navigational abilities, preventing them from returning to their hives.'

According to the passage, which of the following is true about the causes of bee population decline?

Accepted Answer

Multiple factors have been identified, but their relative importance is disputed

Answer

The passage explicitly states that 'researchers debate which factor is most significant,' confirming that multiple factors exist but their ranking is disputed.

Question 3

Passage: 'Urban heat islands — metropolitan areas significantly warmer than their rural surroundings — form primarily because dark paved surfaces and buildings absorb and retain solar radiation. Vegetation, which naturally cools through evapotranspiration, is largely replaced by impervious surfaces. As a result, city temperatures can exceed nearby rural areas by 1–7°C. This temperature differential intensifies overnight as stored heat radiates outward. Urban heat islands increase energy demand for cooling, worsen air quality, and raise heat-related illness risks, disproportionately affecting elderly and low-income residents who lack access to air conditioning.'

The main idea of this passage is:

Accepted Answer

Urban heat islands are caused by physical characteristics of cities and create health and energy consequences

Answer

The passage explains what causes urban heat islands (dark surfaces, reduced vegetation) and what effects they produce (energy demand, air quality, health risks). B captures both dimensions.

Question 4

Passage: 'Urban heat islands — metropolitan areas significantly warmer than their rural surroundings — form primarily because dark paved surfaces and buildings absorb and retain solar radiation. Vegetation, which naturally cools through evapotranspiration, is largely replaced by impervious surfaces. As a result, city temperatures can exceed nearby rural areas by 1–7°C. This temperature differential intensifies overnight as stored heat radiates outward. Urban heat islands increase energy demand for cooling, worsen air quality, and raise heat-related illness risks, disproportionately affecting elderly and low-income residents who lack access to air conditioning.'

According to the passage, why does the temperature differential between cities and rural areas intensify at night?

Accepted Answer

Heat stored in urban surfaces during the day radiates outward after sundown

Answer

The passage states that 'stored heat radiates outward' overnight, explaining the intensification of the temperature gap at night.

Question 5

Passage: 'The Columbian Exchange — the transfer of plants, animals, diseases, and ideas between the Americas and the Old World following Columbus's 1492 voyage — fundamentally reshaped global demographics and diets. European diseases, to which indigenous Americans had no immunity, devastated native populations by up to 90% in some regions. Simultaneously, New World crops like potatoes, maize, and tomatoes transformed European and Asian diets, enabling population growth that would not otherwise have been possible. The exchange was therefore a paradox: catastrophic for indigenous peoples but nutritionally transformative for much of the world.'

The author describes the Columbian Exchange as a 'paradox' because:

Accepted Answer

The exchange produced devastating consequences for some populations while benefiting others

Answer

The author uses 'paradox' to capture the simultaneous catastrophe for indigenous Americans and nutritional benefit for Europeans and Asians — contradictory outcomes from the same event.

GMAT Practice Test

GMAT Practice Test

GMAT Verbal: Reading Comprehension Main Idea and Detail